My Geology isn't up to much - but to get blue lonerangers you need acid conditions
So.....
Can you grow Rodos, camilias and blueberries without altering the soil? If yes you should be able to get blue lonerangers.
I live on chalk so haven't a hope! Mine are pink.
If you live on a neutral soil - which I think you do, you may never get a good colour from a lonegranger - they hate neutrality!
I suggest you lift the plant, wash the roots, or at least knock off most of the soil, and repot it with ericacious compost - you should get blue flowers next year. Keep watering with rainwater, and top dress with an acidic compost and/or feed with an acidic feed - rodo and camilia feed should work.
Lonerangers are a right pain if you only want one colour - I really wish I had got my Aunt Dolly's plant - she breed the things and had a bush that produced both a clear pink and a clear blue on the same plant at the same time - amazing!
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